TROJ_AGENT.ARDU

Malware type: Trojan

In the wild: No

Language: English

Overall risk rating:

Reported infections:

Damage potential:

Low

Distribution potential:

Low

Description: 

A Trojan horse program is a malware that is not capable of automatically spreading to other systems. Trojans are usually downloaded from the Internet and installed by unsuspecting users.

Trojans typically carry payloads or other malicious actions that can range from the mildly annoying to the irreparably destructive. They may also modify system settings to automatically start. Restoring affected systems may require procedures other than scanning with an antivirus program.

For additional information about this threat, see:

TECHNICAL DETAILS


File type: PE

Memory resident:  No

Size of malware: 457,728 Bytes

Details:

Installation

This Trojan drops the following file(s)/component(s), which may possibly be malicious:

  • %Windows%\cashnet\cash.exe
  • %Windows%\cashnet\down.txt
  • %Windows%\cashnet\upd.exe
  • %Windows%\cashnet\XIEXPLORERR.EXE

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT. )

Autostart Techniques

This Trojan creates the following registry entry(ies) to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
atz.exe = "%Windows%\cashnet\atz.exe"

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
mediaplayer.exe = "%Windows%\cashnet\mediaplayer.exe"

Other System Modifications

This Trojan creates the following registry key(s)/entry(ies):

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion
(Default) = ""

Download Routine

This Trojan connects to the following Web site(s):

  • http://{BLOCKED}m.fileden.com/premium/2009/5/5/2431009/xiexplorerr.jpg
  • http://www.{BLOCKED}n.com/files/2009/5/5/2431009/cash.jpg

Affected Platforms

This Trojan runs on Windows 98, ME, NT, 2000, XP, Server 2003.



SOLUTION


Pattern file needed: 6.137.00

Pattern release date: May 18, 2009

Solution:

For Windows ME and XP users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

 Step 1:  Delete this registry value  [learn how]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\Software\Microsoft\
    Windows\CurrentVersion\Run
    • atz.exe = "%Windows%\cashnet\atz.exe"
    • mediaplayer.exe = "%Windows%\cashnet\mediaplayer.exe"

 Step 2:  Delete this registry value  [learn how]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
    Windows\CurrentVersion
    • (Default) = ""

 Step 3: Search and delete these files  [learn how]

*Note: There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.

  • %Windows%\cashnet\cash.exe
  • %Windows%\cashnet\down.txt
  • %Windows%\cashnet\upd.exe
  • %Windows%\cashnet\XIEXPLORERR.EXE

 Step 4: Scan your computer with your Trend Micro product to delete files detected as TROJ_AGENT.ARDU  

*Note: If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.




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